Python Automation Testing (ETL Testing)
Cognizant
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Job Description
Work model : Hybrid
Job location : Bangalore
Job Description
We are looking for a skilled Python Test Engineer with strong ETL and Data Testing experience to validate data pipelines, data warehouses, and large-scale data integrations. The ideal candidate will have hands-on experience in Python automation, SQL validation, and ETL testing across complex data ecosystems.
Key Responsibilities
- Design and execute ETL test cases for data extraction, transformation, and loading processes
- Validate source-to-target data mapping, transformations, aggregations, and business rules
- Develop and maintain Python-based automation frameworks for data testing
- Write complex SQL queries for data validation and reconciliation
- Perform data quality checks (completeness, accuracy, consistency, duplication)
- Test data pipelines built on cloud or on-prem platforms
- Collaborate with Data Engineers, Analysts, and Business teams to understand requirements
- Identify, log, and track data defects through closure
- Support regression, performance, and reconciliation testing for ETL jobs
Required Skills
- Strong proficiency in Python (pytest / unittest / custom frameworks)
- Solid experience in ETL Testing & Data Warehousing concepts
- Excellent SQL skills (joins, subqueries, CTEs, window functions)
- Hands-on experience with ETL tools (Informatica, Talend, SSIS, DataStage, etc.)
- Experience validating data in RDBMS (Oracle, SQL Server, PostgreSQL, MySQL)
- Understanding of data models, star/snowflake schemas
- Experience with Unix/Linux commands
- Familiarity with Agile/Scrum methodologies
Good to Have
- Cloud data platforms: AWS (Redshift, Glue, S3) / Azure (ADF, Synapse) / GCP (BigQuery)
- Big Data technologies: Spark, Hive, Hadoop
- CI/CD tools: Jenkins, Git, GitHub Actions
- API testing experience for data services
- Exposure to data migration or data lake testing
About The Company
Cognizant
Cognizant (Nasdaq-100: CTSH) engineers modern businesses. We help our clients modernize technology, reimagine processes and transform experiences so they can stay ahead in our fast-changing world. Together, we’re improving everyday life. See how at www.cognizant.com or @cognizant.
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